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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd215f4e484231adc25d93ab90e211c7ac0f1495e55938ba59fff5f06438509' 
  AND token = 'Ia+mLPjjd55X2y3ygMbjXsiXgoRHNeTl0tUl9sdkb7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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