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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ae0c13451351dd6caee68f3929cf6b47ead020b5912233039d7f1663dc72a1' 
  AND token = 'bQ/OtF/6VBzxHNH1xwGqRdtMne5z33lg8vgJV6/mcnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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