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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5734f9d681fcabe76ef03611f374dd6a13166d3574eb1afaeed31f7532a6c1' 
  AND token = 'Y8b775/ZW/l1QqaTrFyNhpYqwt206CAuFDwZWzu2VC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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