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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a470bd406fb13b3fb0f731e4a5f75ec3edc20759cb368397dce71b6e1c14b2' 
  AND token = 'yrtkCeA7E2DoYUYeo55w152W6Sg7xat+cgBZdzzo48w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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