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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac7f427cff81c1f1d732c568f2b76f16103c2f0dd34dbaf9dd48f88124c9135' 
  AND token = 'c5dB14Gq4c9JBI28XJAQNuvc2PQKCzM9IYpdXrnsR3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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