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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542275c5ae46aeb7c939f2369393facddb52fadc59982b8e5cbfbf7a11ed740b' 
  AND token = 'Xh1NGsRqbUL7nSL1djsxXRJLU1EPsoib6L7xX3z2/6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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