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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49707884c220d0073f10314f10ac0e33444b3710e277f495bb43f2702a1aba7' 
  AND token = 'yTZS4EpQuvm76Zpky4pvHHcMW+ej1tNsby82X6zW5xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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