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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1658662a0880ebe253680cee92d6858422c4519d0310e2562aa14cc2162bc01' 
  AND token = '8gwkb/55McB5ADeSSCIpU4IIDgtLYimCPi+LXGC/JQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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