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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c03c209f75af07506e794fa99106d32c31d0b6ea7b53665026cd499beff65c4' 
  AND token = 'lWWXv0YDi+adg48/uUGbyFxrV0yyqbBm+0/KgbjcG3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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