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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c993b5676ee2d482e1dcbc5cdd491706ba0f59eef6cc15ccdd2eaf6247e2c4c' 
  AND token = '3ErHy8W/vIWkTLVjvn2FRH4toMk43JVmkhzEW++guCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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