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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e632728249bfbbe00fec0f610af3ebeddf3f4d4831421edb9184fef8ae97d4' 
  AND token = '6I1OCcGOZLOJH4WdwsTTtlAcXnMXV2thZB+YSP/s1yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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