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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c66989cbd1b6d300c2a7a41788078e31a5ccac5773ca6b629626b8316d22b6' 
  AND token = 'UtXV1n0uHMbOIHfIIJ4D21sFBnVAVrwROzwRiNjRisU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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