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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b90793a5979b1f38153cc1419ce6af39c9747e6e68facc760a8e06f6ced31a8' 
  AND token = 'Th6ZgLRmmKW4Cx0tceJbEjgHXvxITi644wdUD3VPwqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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