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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f360b16d559062252f83e079fa02d2c1c4056724c5dbd33061a45d5ccb109681' 
  AND token = 'QbjzfBIogy4iBENwvcj/VxpKMJcAOPdU3EtLVkA0l+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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