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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794629b00621471822aae51609f2fe693c6aa60aa99cd678ef4a4dcc7f675e7e' 
  AND token = 'eQJ+w3K46il0ysLQlkBXQbdJSx+fCvQCiFEUvEDPf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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