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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ac9f6cdad84d5f38a6f869e9547df5f8cc4885f0a47190296e768f6aed2175' 
  AND token = 'ZlV/wwiEEa5im8CXK66qP4/SfQ1E0Q6bXBRgcLiXLn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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