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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2d08c57c1d02d4ccc5ab3d8877e3f6b5cfb3b1d8834b752124580f2dde362a' 
  AND token = 'qfi+8qt6/KYE//WbcYHFChtsXHDvmk6/qpLqRMSUWEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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