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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4faff1a819fb31f885d680a0b1f70413ea7e3693a75eacadba8ae5197bf0b3' 
  AND token = 'zt9IEQJuEOzeZ7+CYZx1uhKlPGp14ue89Xo1tumc+U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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