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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356d70f7d056c4ab80fff0441b79aaad73d252079b0fcea082dbad59409bd054' 
  AND token = 's6hZS2VVB8V3ZJkWkeF5tRt2KqTEFDP+AqQHqqRH9wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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