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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263d4c36de6f230992267b1bdc4d40b37c52be22f40990f3cfb430d35f15cfbd' 
  AND token = 'iiaeGYj+okc0t2mvs5TWTKpArd1/VZf3BLVmEa6RiFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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