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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a6a2dd7bc02974e343e2cd4767f68b43fd41032c22b2a36a371e5cea3f2c85' 
  AND token = 'QOeOeEroKVi6HhFyBw1vWlpOotSdv+MhlB1EGLgu1Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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