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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260ac79c294f8129694699bceea07e959e56ab518be8109d77708822a6e94480' 
  AND token = 'QG1a8MgdH3xtBJHXnDqCNDUbSe3f7I8h48nTvFcXqLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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