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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bcff4d62072f17a2ecd4897f277379c991ef4986af7e51b9d23cf2044e38a5' 
  AND token = 'CCIRXyHZs2d4xeXkFAz4FWg9l0ho/CN/pU8OzvYlfAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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