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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16931697df58900f2e181f08bf6ca330e3a34dbf3662bc254f1c8b157c496cd8' 
  AND token = 'F8c6YRolzxyytsU97Ii/aVUuYHlbdt8asDcqkmjsgxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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