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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859a16ae116d0d33e5817ffc24b2e7d06a9858a7403904a33ece1622bf605e2a' 
  AND token = 'aMssCQZyvP/Y1SPRiqjjgb3Egn3csHtduqrdKpO7FCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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