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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875c3de7ef7b74d2b126c89840267dd6d6a77acd6387481d72127515557c865a' 
  AND token = 'hAPXbDFLNXnavWkDIxv69Va95vQcCQHm6K2nVIp44Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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