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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b57431685e256d80d8b961364135c9117bb4186334d565df69b292f899c8a6a' 
  AND token = 'CYjjit1iq7x/Zhl4jbS+4+kvqavJSc+7HikIea9W3lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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