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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfb046954e634c01ed1447f481df353dcd21fb751b1fb69bad63ee03c048beb' 
  AND token = 'Rao5eZaoZ8nB+GYlnPmPElIFlkySKF0PKyooy0Ce3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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