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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3744dc7132fd43f7ff1d5d3e3e623155d90b75af82c5a496ed1d4fb97537c1' 
  AND token = 'fkm8vTT6Xa/+9YnJPFb3MlF6rK63S6fNBjb5Kl8W5pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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