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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe1d90eed427dd534f12a96cd961101bd17ae6247092a15921ca62186f984f' 
  AND token = 'gz/p+y/upY5TiN1EyxSopHkvP0NszT1JdT7lWNZySsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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