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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f641862a068a63234338e351b6613b41b99119370c8af00db7fc1e1f39868e30' 
  AND token = 'FNhm3PbqWVgne0lDoIculmDvuj9pC5R+2ghwAhF4eg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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