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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb012752e5a4c165954791337bbbbf18e63bc66629a2bcd197438ccf1ee908e2' 
  AND token = '3mw1pnE9LwXEzsR2tFHn5aUfNTGiL5p6hcjM0LqOrg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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