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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f5def4337d3216c19ae1c075c61d4d9d4942c6aaa4f0dc143c04c38e89be46' 
  AND token = '6xYMCljgP7mAtQHrpuFHuPbyAOytcH8W/6uE2bGId08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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