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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acfcb26055426b2deeecb89d420f29ad31b49aee86de10bd62bff11a2894988' 
  AND token = 'D9tfgrZzgk4VMSdhA66PAvS9yimAFYYKmlgRWE2Kwo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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