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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db89c07dc02dbe73d728ef139ff2577240e3912f358a6be297db5c0c5381a9c7' 
  AND token = '3vFkV0/KoeHsyYqs7FLahDqMwjI+Y/+dowq+PQk13M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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