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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c6cb673667f8b98650bef56f175b810b1941a0e0c56383fec27b13125940c5' 
  AND token = '/L+KX1mC2Na/U+ls+NKbo9D4H4G3pLcsVSsiv4Xz+mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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