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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9629a22d2a59efa90274a69565a8cc345c5949dcfa1ac2d12a9e4b7b5490aa' 
  AND token = '7DMH3KFWHucq3CiiRRmwQ/i11F/DUPoRtl+Ky7nO6VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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