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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeae1537a1e3f9c95790aafb628df6ff46cfa76a9beae56ad9aec3c6cc16389a' 
  AND token = 'yz66m5koSaoDcUN/m5letHyZtGk+xq84ai7Do3cl9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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