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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9226f6eb9b9842e3b5189dbb9fe2974a15a376ca87b35f8cd3344f26ff813f' 
  AND token = 'Mhfoq3g+DfKTlrK9vrG2dG56KEKOpS61z0UD9kJ5RSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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