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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f183718f8d3ba1f4ec3d67c08797da56a291260a01ea8e5913a0f4d0de8b095' 
  AND token = 'XhUkNWvpO4HVb2+lP5mmzBnTBZkLgXFTzWHyX0317to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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