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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8656558e8ffe1580403991f1b3cd98361971c0cb936d6559b6df39ed2700b3' 
  AND token = 'kbhXabF8w0wnkWnTgnNzgRU2WotOPcMbH/sfAOouyaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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