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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1ac64649ee50566e3fe8430ec42218bee6d765116865c61368c289b00822f9' 
  AND token = '9ql9lWGIRwyou2tePPTQGVZ3HA32FogP5Kejq/5Gbfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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