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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c34ecf14b42499ce5485d5da73466ee93490c00bd659cc969ce3d8d35e4622' 
  AND token = '5PHI78QfY26ORr2rkqTfQMVI+hnNYahLJoWOXXoPKr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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