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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f14dc68017c00a78cf25f30b15e9a4044a1838e7ea1a3c0db80137d4587e37' 
  AND token = 'Aoa2lDUyYpjw+5JkRotvU2XanlUZelk2TxtDwFdEqxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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