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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2f2bdbf0984342b2469fb132f004d197d633044385ca2ed7a4370eebe98988' 
  AND token = 'gLbWVVJRNEhJ/Lch8zKNH/CZ8F/lSfWKkaeC3BdXzFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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