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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef62a5bf779e63b6ecbeaf99d84c5227a36cc151076ed5321a2fa16491273f5' 
  AND token = '2f/eapxBPBB/78EjT/OVklcxFKIpLGCK1G6cY5HcBiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}