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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbbd273e16de49ab89b6838b1b10f6e77e52564fb386c8643e3434b909b35f3' 
  AND token = 'QBTWrwKsf++keLeXQ4477YXNn+r+Fjozl4hH82bJbCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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