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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9305d66d29efb2321879ba09e0a12dd0c3b0ffd37d6f5919f0e95f13491d1fd' 
  AND token = '/R5xVflF5kUNvJ1vAYTmGaM5XocdWOcLCyN08oXIAcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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