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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b22933feb3d6c6e6bc88a3c3d04987c4936d2cb46ab0b0f6f11d37d77c8ff0' 
  AND token = 'v0BF5RGQGHsICmZobgOZakJ/ZlyRZy9UVufj56CmtEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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