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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adab00d14f6a3ade3399ffa777477ee1f9a4dc7c1d20e416efe52d05c6744e0' 
  AND token = 'B48f/AfuFCvonLbSvewsntc7WS9EOm+E+Ir4B3OK1as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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