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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bde53738139ccc9175af267eba4506cc37246afde6ed6949ee0d0f63248adc' 
  AND token = 'dc92j1PFVpgMsEp0RLLJHy+BOhhhXJ/q3yo9bNKFkIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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