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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5da967de1928f1d1747fdeee039f10e3df664861fa0fc6efdbffbc820087086' 
  AND token = '720m3J5cXkHstZZyOh2mqnqTcogxZ01Uoh3kOus8BBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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