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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257916c2daacb9976bdefc0794cf686292f67744320fc14583777ed19528b212' 
  AND token = 'Nd3EP1y4vO4P4a+GkXB/eVBN16SKSn3rGVxpITwgUVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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