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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033121d8a668382f210610b0a84e1b383d3311df96f092f353736ebb556e5230' 
  AND token = 'NBSjsm1Ti51nOClr0wLcth9BrTo4HhR4zUGLZ8s71w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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