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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9feee40277c2897049f2c83a94e2fe5945c5f80bab82d5ded6404625403fca6' 
  AND token = 'VJn7Dja4XZkEwldoWrLzM3afKZI2g74B7FSxdvwLA6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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