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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e549a545a7c9fb6559aab40460c2e81c58def923e7352153e65c85e415311f2' 
  AND token = 'Gh29fc8bDtYP8GYCA5tfTfPFi7sUqb/BVf2c8DEGfNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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