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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5da03136fed380fb242219c88688af2b284c061030786eb135c9fc3ff91ca0d' 
  AND token = 'a2toyq0Us1GAyYL3f68he3e223gq121vZysFoeVFOhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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