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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae2d4759f239f02a7ffd0038ce04b90ecd505191a1a00e600f3f4a79babf913' 
  AND token = 'l+luWDk6SLo+HM+8OUeYcRP02B5FjaKG69u+rWIbP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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