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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edbf27fa48ef845180b4079bc605a1f8dbea8590d8fdb834d1c8c0cc8bd9f5e' 
  AND token = 'g3XevPG7mtGml8AOp0Rrl9jaQXGggmiwTfDYDR4RGWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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